Task #7638: Fix ansible_python_interpreter issues in pulp_installer
pulp_rpm_prerequisites sets ansible_python_interpreter unnecessarily
There is no reason it should be set to:
Since the behavior of auto_legacy and auto is to set it to that (python2) anyway.
It also would only affect the role (and later applied roles) at most, since the role is always (and conditionally) dynamically included. If it has any effect, this makes it harder to test the installer, different interpreter depending on whether or not pulp_rpm is getting installed.